Domain Architect

Domain Architect

Remote - EST or CST timezone

Long Term Contract

Must Haves - -

• 10+ years of experience building payment systems
• Expert level C#/ .Net 8 - must be currently hands on
• Azure PaaS experience
• Kafka experience (in production)

Domain Ownership

· Own the domain's architecture, technical roadmap, and key decisions

· Define domain boundaries, domain model, and shared vocabulary

· Decide which service or workflow owns each business operation

· Write ARB-ready specs and ADRs

Architecture & Design

· Design idempotent, exactly-once operations (sagas, compensation, outbox/inbox, reconciliation)

· Define API and event contracts with peer domains (OpenAPI, JSON Schema, Protobuf)

· Establish trust boundaries: who computes data, who validates it, and what consumers can rely on

Workflows & Messaging

· Build durable workflows on Temporal , including Nexus cross-domain calls

· Set versioning standards for long-running workflows (patching, build IDs, replay testing)

· Design Kafka domain events with schema governance, retries, and dead-letter queues

Payments

· Architect payment workflows across the order lifecycle: create, edit, cancel, finalize, refund

· Design multi-tender orchestration across credit/debit, EBT SNAP, and EBT WIC

· Architect processor and benefit-provider integrations: auth, capture, void, refund, reversal

· Handle gateway timeouts and unknown outcomes without double-charging or leaving ghost charges

· Ensure EBT SNAP and WIC compliance with USDA FNS and state program rules

· Lead PCI DSS scope reduction, tokenization (network tokens, DPAN), encryption, and key rotation

· Extend the domain to new tenders such as Apple Pay, Google Pay, and split tender

· Support 3P marketplace payments: multi-capture, over-capture rules, and split settlement

· Partner with Finance on reconciliation, TLOG reporting, and general-ledger accuracy

· Define payment SLOs: auth rate, capture success, refund success, and compensation failures

Reliability & Quality

· Build resilience with Polly and Temporal retry policies

· Keep payment authorization well within checkout timeout budgets across Azure and GCP

· Instrument tracing across Kafka, and Temporal with OpenTelemetry

· Set the testing strategy: unit, contract, replay, gateway simulation, and load

Leadership

· Review production code and mentor senior engineers

· Lead feature-flagged migrations off legacy paths

· Use AI coding agents and context engineering to speed up delivery

Must-Have

· [ ] 10+ years engineering, 5+ years building payment systems

· [ ] Domain-driven design: bounded contexts, domain events, context mapping

· [ ] Expert C# / .NET 8+ and still codes

· [ ] Temporal (preferred) or similar durable workflow engine in production

· [ ] Kafka in production

· [ ] Azure PaaS: App Service, Cosmos DB, APIM, Key Vault --> Similar technology on Google Cloud Platform

· [ ] Containerization, running code in Kubernetes

· [ ] Idempotency, saga, and reconciliation patterns in production

· [ ] PCI DSS and tokenization

· [ ] OpenTelemetry or APM observability design

· [ ] Track record of aligning multiple teams on a shared architecture

Nice-to-Have

· [ ] Temporal Nexus or Worker Versioning

· [ ] EBT SNAP / WIC processing

· [ ] Digital wallets: Apple Pay, Google Pay

· [ ] Gateway APIs: Aurus, Adyen, Fiserv, Worldpay, Chase

· [ ] Network tokens, DPAN, multi-capture, marketplace split settlement

· [ ] Multi-cloud: Azure + Google Cloud Platform

· [ ] LaunchDarkly-driven migrations

· [ ] .NET Aspire, Testcontainers, Mockoon/WireMock

· [ ] Retail finance feeds (TLOG, sales audit, GL)

· [ ] Grocery/omnichannel retail

· [ ] Google Cloud Platform experience